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Add concept page about Controllers (#15733)

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* Add controller concept

* Fix controller glossary entries

* Link from Understanding Kubernetes Objects to Controllers
This commit is contained in:
Tim Bannister
2019-10-02 18:06:08 +01:00
committed by Kubernetes Prow Robot
parent bf83aaf699
commit 9a7b191bcc
14 changed files with 203 additions and 31 deletions
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content/en/docs/concepts/workloads/controllers/jobs-run-to-completion.md
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@@ -173,10 +173,10 @@ parallelism, for a variety of reasons:
- For _fixed completion count_ Jobs, the actual number of pods running in parallel will not exceed the number of
remaining completions. Higher values of `.spec.parallelism` are effectively ignored.
- For _work queue_ Jobs, no new Pods are started after any Pod has succeeded -- remaining Pods are allowed to complete, however.
- If the controller has not had time to react.
- If the controller failed to create Pods for any reason (lack of `ResourceQuota`, lack of permission, etc.),
- If the Job {{< glossary_tooltip term_id="controller" >}} has not had time to react.
- If the Job controller failed to create Pods for any reason (lack of `ResourceQuota`, lack of permission, etc.),
then there may be fewer pods than requested.
- The controller may throttle new Pod creation due to excessive previous pod failures in the same Job.
- The Job controller may throttle new Pod creation due to excessive previous pod failures in the same Job.
- When a Pod is gracefully shut down, it takes time to stop.
## Handling Pod and Container Failures